Jackson, fighting in the final bout on his current UFC contract, voiced his displeasure with the organization and his perceived mistreatment heading into the bout. His gripes included everything from unfavorable matchmaking to poor compensation to mistreatment of his sponsors, including Reebok.

The former titleholder, who unified the titles in 2007 when the UFC bought and ultimately disbanded the Japanese-based Pride organization, was once one of the organization's biggest stars. But the 34-year-old's latest setback, which came via 30-27, 30-27 and 29-28 scores, marked his third consecutive loss.

Teixeira, a fast-rising contender now on an 18-fight win streak, was quicker to the punch, easily scored takedowns, and capitalized as Jackson started to fade after the first round. It was a difficult matchup for Jackson, who landed some heavy punches, including some stinging uppercuts, but never had his opponent in any real trouble.

UFC President Dana White, who was quick to come to Jackson's side after a bizarre mental breakdown and arrest in 2008, said earlier this week that he wasn't necessarily ruling out a new contract for the fighter.

However, Jackson, who's long had a surly side, suggested his time in the UFC is done.

"To my fans, we know we won the UFC and Pride titles - first time ever that happened," he said. "I'm happy to end on an exciting fight for them. I came in to the UFC exciting, and I left exciting."

Stupp writes for MMAjunkie.com, part of the USA TODAY Sports Media Group